Hirsch, T. J. (1992). Working research: Strategies for inquiry. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Hirsch, Timothy J. Working Research: Strategies for Inquiry. Englewood Cliffs, N.J: Prentice Hall, 1992.
Lua MLA (9ú heag.)Hirsch, Timothy J. Working Research: Strategies for Inquiry. Prentice Hall, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.